Most Holy Family Monastery is a radical sedevacantist Catholic sect currently run by brothers Frederick Dimond (pseudonym "Brother Michael Dimond, O.S.B.")[1] and Robert Dimond (pseudonym “Brother Peter Dimond, O.S.B.")[1] in Filmore, New York. It makes the proud (but unproven) claim of having the "most visited traditional Catholic website", and offers free Catholic DVDs and online streaming videos. The Southern Poverty Law Center (SPLC) declared the organization a hate group due to its strong antisemitic views.[2]

The sect represents itself as a "Benedictine community" without any qualifications; founder Joseph Natale never took religious vows and thus was not a Benedictine monk in the eyes of the Catholic church.[3][4]

Rock musicians such as Elvis, The Rolling Stones, AC/DC, Madonna, Iron Maiden, etc are possessed by demons and listening to their music allows demons to put you in a "zombie-like trance". According to them rock musicians leave clues making it easy to spot their demonic nature (for example if you turn a copy Prince's 1999 album upside down, you get 666).

The group is also apparently sympathetic to geocentrism - while they don't endorse it outright, they mention that many of their followers debate whether or not one is required to believe in a geocentric model (some citing Psalm 103:5 in support). The Monastery maintains that one doesn't have to believe in geocentrism to be a "true Christian".

Most of its content isn't available from the main page, but can be found using the site's search engine. It also runs a YouTube channel "vaticancatholic.com".

In 2005, Eric E. Hoyle, a former high school chemistry teacher, contributed nearly $1.3 million in cash and stock to the MHFM and took up residence at their "monastery" as a "Benedictine monk". Hoyle later became disillusioned with the sect and tried unsuccessfully to sue the brothers.[16]